x的平方乘以y比上x的三次方加y的三次方求极限-搜答案-搜狗做题网

实数y=根号下x减2加根号下2减x有意义∴﹛x-2≥02-x≥0∴x=2此时y=0x²×y³=0

x^2+2x+y^2-6y+10=0可以化解为（x+1)^2+(y-3)^2=0,等价于x+1=0且y-3=0,所以有x=-1,y=3,故x^3*y=-3.

x^3-9x^2+8x+60=0x^3+8-9x^2+8x+52=0(x+2)(x^2-2x+4)-(x+2)(9x-26)=0(x+2)(x^2-11x+30)=0(x+2)(x-5)(x-6)=0

x+y=7x^2+y^2=55(x+y)^2=x^2+y^2+2xy=492xy=49-55=-6,xy=-3（x^3）·（y^3）=(xy）^3=(-3)^3=-27

X³+Y³=(X+Y)(X²-XY+Y²)

x^3y-2x^2y^2+xy^3=x^3y+2x^2y^2+xy^3-4x^2y^2=xy(x^2+2xy+y^2)-4x^2y^2=xy(x+y)^2-4x^2y^2=12×7×7-4×12×12

3x^2-x=19x^4+12x^3-2x^2-7x+2005=3x^2×(3x^2-x)+5x×(3x^2-x)+(3x^2-x)-6x+2005=3x^2+5x+1-6x+2005=3x^2-x+

x³+x²y+xy²+y³=x²(x+y)+y²(x+y)=(x+y)(x²+y²)

x^3+3x^2-3x-9=0x^2(x+3)-3(x+3)=0(x+√3)(x-√3)(x+3)=0所以x=-√3或x=√3或x=-3

(x-y）³×（x-y）²×（y-x）=（x-y）³×（x-y）²×[-(x-y)]=-（x-y）的6次方

x+y=1则x^2+y^2+2xy=1因为x^2+y^2=3则xy=-1x^3+y^3=(x+y)(x^2-xy+y^2)=1*(3+1)=4

先分解因式,后乘法.(X^4-Y^4)/(X^3+X^2Y+XY^2+Y^3)=(X-Y)(X+Y)(X^2+Y^2)/(X^3+X^2Y+XY^2+Y^3)=(X-Y)(X^3+X^2Y+XY^2+

原式=4(x-y)^3*(-1/8)(x-y)^6=-(1/2)(x-y)^9

1、-(X-Y)的8次方2、-（A-B-C)的6次方都是偶次方是不是可以化为正呢?!

(x²)³×x²×(2x)²=x^6×x²×4x²=4x^(6+2+2)=4x^10

你可以看了,心形的

x³-y³-x²y+xy²=(x³-y³)-(x²y-xy²)=(x-y)(x²+xy+y²)-xy

设lnx=t,x=e^t,dx=e^tdtS(lnx)^3/x^2dx=St^3/e^(2t)*e^tdt=St^3e^(-t)dt=-St^3d[e^(-t)]=-[t^3*e^(-t)-Se^(-

(-2x^my^3)*(3x^3*y^2)*(5x^2y^n)=-30x^4y^3-30x^(m+3+2)y^(3+2+n)=-30x^4y^3m+3+2=4m=-13+2+n=3n=-2

(x+y)(x^2-xy+y^2)